[WIP] do something :-)

Source/platform/graphics/paint/DisplayItem.cpp

Index: Source/platform/graphics/paint/DisplayItem.cpp
diff --git a/Source/platform/graphics/paint/DisplayItem.cpp b/Source/platform/graphics/paint/DisplayItem.cpp
index 25b0bcf79e4bb6e243f672e6e88edb6c865b86af..69de77ee826839164e9839193eb0d66f53e3dac1 100644
--- a/Source/platform/graphics/paint/DisplayItem.cpp
+++ b/Source/platform/graphics/paint/DisplayItem.cpp
@@ -5,17 +5,11 @@
 #include "config.h"
 #include "platform/graphics/paint/DisplayItem.h"
 
+#include "wtf/SizeAssertions.h"
+
 namespace blink {
 
-struct SameSizeAsDisplayItem {
-    virtual ~SameSizeAsDisplayItem() { } // Allocate vtable pointer.
-    void* pointer;
-    int ints[2]; // Make sure other fields are packed into two ints.
-#ifndef NDEBUG
-    WTF::String m_debugString;
-#endif
-};
-static_assert(sizeof(DisplayItem) == sizeof(SameSizeAsDisplayItem), "DisplayItem should stay small");
+ASSERT_SIZE(DisplayItem, 16, 24);
 
 #ifndef NDEBUG